SHREDDING MACHINES

摘要

PCT No. PCT/GB79/00112 Sec. 371 Date Mar. 5, 1980 Sec. 102(e) Date Mar. 4, 1980 PCT Filed Jul. 4, 1979 PCT Pub. No. WO80/00128 PCT Pub. Date Feb. 7, 1980.In a shredding machine having contra-rotating cutter shafts (16,17) carrying cutters (18), one shaft (16) is at a lower level than the other and the side of the shredding chamber (12) alongside the lower shaft has an ejection chute (71) for intractable material. The chute is normally closed by an access door (74), which when open allows the intractable material to be ejected by reversal of the lower shaft (16). The feed hopper (13) has internal doors (80,81) movable to position obstructing the feed when intractable material is to be cleared from the cutters. An automatic, sequential control system is preferably provided for opening and closing the access door and hopper doors in conjunction with a reversing sequence for the cutters.